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The LLVM compiler database JSON already includes a directory where the build was performed: https://clang.llvm.org/docs/JSONCompilationDatabase.html Prefer this directory for fixing relative paths in compiler include arguments in ale#c#ParseCFlags. Without this change, users cannot create a symlink to their compilation database as suggested in the LLVM tooling setup instructions: https://clang.llvm.org/docs/HowToSetupToolingForLLVM.html